diff --git a/src/Snap.Hutao/Snap.Hutao/Service/Metadata/CombineResultMaterialIdMapFactory.cs b/src/Snap.Hutao/Snap.Hutao/Service/Metadata/CombineResultMaterialIdMapFactory.cs
new file mode 100644
index 0000000..120b7e9
--- /dev/null
+++ b/src/Snap.Hutao/Snap.Hutao/Service/Metadata/CombineResultMaterialIdMapFactory.cs
@@ -0,0 +1,64 @@
+// Copyright (c) DGP Studio. All rights reserved.
+// Licensed under the MIT license.
+
+using Snap.Hutao.Model.Intrinsic;
+using Snap.Hutao.Model.Metadata;
+using Snap.Hutao.Model.Primitive;
+using System.Collections.Immutable;
+
+namespace Snap.Hutao.Service.Metadata;
+
+/// <summary>
+/// Combine 元数据中多条配方可共享同一产物 Id（例如元素断片既有 3×碎屑合成，也有用其他元素石与尘的转化）。
+/// 构建 MaterialId→Combine 映射时必须优先保留「单材料×3→产物×1」的合成台主链，否则后项覆盖前项会导致养成统计无法向下展开原料。
+/// </summary>
+internal static class CombineResultMaterialIdMapFactory
+{
+    public static ImmutableDictionary<MaterialId, Combine> ToImmutableDictionary(ImmutableArray<Combine> combines)
+    {
+        Dictionary<MaterialId, Combine> map = [];
+
+        foreach (Combine current in combines)
+        {
+            MaterialId key = current.Result.Id;
+            if (!map.TryGetValue(key, out Combine? existing))
+            {
+                map[key] = current;
+                continue;
+            }
+
+            if (ComparePreference(current, existing) > 0)
+            {
+                map[key] = current;
+            }
+        }
+
+        return map.ToImmutableDictionary();
+    }
+
+    /// <summary>正数表示 <paramref name="incoming"/> 应取代已有项。</summary>
+    private static int ComparePreference(Combine incoming, Combine existing)
+    {
+        return Score(incoming).CompareTo(Score(existing));
+    }
+
+    private static int Score(Combine c)
+    {
+        if (c.Materials.Length is 1 && c.Materials[0].Count is 3 && c.Result.Count is 1)
+        {
+            return c.RecipeType switch
+            {
+                RecipeType.RECIPE_TYPE_COMBINE => 300,
+                RecipeType.RECIPE_TYPE_CONVERT => 200,
+                _ => 150,
+            };
+        }
+
+        if (c.RecipeType is RecipeType.RECIPE_TYPE_COMBINE)
+        {
+            return 100;
+        }
+
+        return 0;
+    }
+}
diff --git a/src/Snap.Hutao/Snap.Hutao/Service/Metadata/MetadataServiceImmutableDictionaryExtension.cs b/src/Snap.Hutao/Snap.Hutao/Service/Metadata/MetadataServiceImmutableDictionaryExtension.cs
index 0b93ecf..f7ced14 100644
--- a/src/Snap.Hutao/Snap.Hutao/Service/Metadata/MetadataServiceImmutableDictionaryExtension.cs
+++ b/src/Snap.Hutao/Snap.Hutao/Service/Metadata/MetadataServiceImmutableDictionaryExtension.cs
@@ -216,12 +216,17 @@ internal static class MetadataServiceImmutableDictionaryExtension
                 token);
         }
 
-        public ValueTask<ImmutableDictionary<MaterialId, Combine>> GetResultMaterialIdToCombineMapAsync(CancellationToken token = default)
+        public async ValueTask<ImmutableDictionary<MaterialId, Combine>> GetResultMaterialIdToCombineMapAsync(CancellationToken token = default)
         {
-            return metadataService.FromCacheAsDictionaryAsync<MaterialId, Combine>(
-                MetadataFileStrategies.Combine,
-                c => c.Result.Id,
-                token);
+            string cacheKey = $"{nameof(MetadataService)}.Cache.{MetadataFileStrategies.Combine.Name}.Map.{nameof(MaterialId)}.{nameof(Combine)}.PreferThreeToOne";
+            ImmutableDictionary<MaterialId, Combine>? result = await metadataService.MemoryCache.GetOrCreateAsync(cacheKey, async entry =>
+            {
+                ImmutableArray<Combine> array = await metadataService.FromCacheOrFileAsync<Combine>(MetadataFileStrategies.Combine, token).ConfigureAwait(false);
+                return CombineResultMaterialIdMapFactory.ToImmutableDictionary(array);
+            }).ConfigureAwait(false);
+
+            ArgumentNullException.ThrowIfNull(result);
+            return result;
         }
 
         private ValueTask<ImmutableDictionary<TKey, TValue>> FromCacheAsDictionaryAsync<TKey, TValue>(MetadataFileStrategy strategy, CancellationToken token)